Piston-drum for rotary engines.



R. EISERMANN. PIS TON DRUM FOR ROTARY ENGINES.

PILI-ID MAY 18, 1910.

Patented Man?, 1911 RUDOLF EISERMANN, OF BERLIN, GERMANY,ROTATIONS-MASCHINEN GESELLSCHAFT M.

ASSIGNOR TO INTERNATIQNALE B. H., OF BERLIN, GEBMANY.

PISTONJDRUM FOR ROTABY ENGINES.

Specifieation of Letters Patent.

Application filed May 18, 1910.

Patented Mar, Ti', 19311..

Serial No. 582,059.

To all ou/tom it may concern:

Be it known that l, RUnoLr EISEREL NN, engineer, a. subject of the Kingof Prussia, residing at Berlin, Germany, have invented certain new anduseful Improvements in Piston-Drums for Rotary Engines; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a' part of this specification.

My invention relates to the structure of the piston drums or rotors ofrotary engines and similar machines, and has for its Object to rendersuch rotors stitfer than at present constructed to prevent the grippingor binding of the blades or abutment slides mounted in the radial slotsthereof.

Eeterring to the drawings, in which like parts are similarlydesignated-h`igure 1 is a front elevation, partly in section, of a rotorembodying one form of my invention. Fig. 2 is a. side elevation thereof.Fig. 3 is a view Similar to Fig. 1, of a modification, and Fig. et is aside elevation of Fig. 3.

In those types of rotors for rotary engines and the like, in which thepi'ston slides move either axially or radially in the rotor, the rotoris slotted radially from its periphery toward its center. The slides arenounted in and slidable in those slots which sub-divide the core orrotor into segments connected together at 'or near the center of therotor, whereby there is only a very small thickness of metal at thebases of the slots to hold the sectors together, as, for eX- ample, thesmall thickness of metal marked in Fig. 2. Though fraetures at theseendangered points are not to be teared, as the pressure on one slidewill, at the least deformation of the drum sector receiving suchpressure, be transferred to the other seetors by the intermediary of theother slides, such transference of pressure produces considerablegripping between the slides and their ways, so that correspondinglygreat losses by frietion are eaused, and the slides may stick and bedamaged in consequence thereof.

According to the present invention I provide distance pieces at suitablepoints, for the purpose of preventing the spring of the I sectors andthe consequent gripping or stick- I ing of the sldes.

In such instances where the slots do not afiord sufiicient space for thearrangemeut of such distance pieces, the drum .may be enlarged at asuitable point, and the distance pieces may then be arranged in thoseparts of the slots which are situated within such enlargement.

Figs. l and 2 of the accompanying drawing exemplify a form for carryingout the present invention in a piston drum or rotor a, which provided asin U. S. Patent No. 894,391, with coucentric working grooves 7) turnedin the end surtace of the rotor, and rad i al. longitu din al grooves cfor receii 'ing the radially moving piston slides g, which have notches?L corresponding to the grooves Z). The slots c subdivide the rotor intothe sectors ?a between them and extend almost to the central shaft,leaving but a small body of metal between the grooves at the inner endsof the slots, so that these sectors will bend at these points whensuficient pressure is placed on the slides in the slots. To obviatethis, I fit in each groove or slot c in the center of the outerlongitudinal edge thereof a piece (Z, so that each two adjoining sectorsof the piston drum cannot alter their distance from each other, and theslides can therefore not be gripped by the spring of the sectors.

The abutment slides or piston slides must be provided with notches Fig.1, considei'ably deeper, or having a radial length considerably longerthan the depth or radial length of the pieces (Z that are fitted intothe outer portions of the slots e to prevent the sector-shaped portionsof the rotor between the slots c from springing or yielding whenpressure is applied to the slides by reason of the fiuid used in themachine. Such notches z' permit the slides g to be properly moved intheir slots without being hindered by the pieces (Z inserted in theouter ends of the slots. The constructional form shown in Figs. 1 and 2,is therefore, generally, only applicable when the bottoms of theoppositely situated concentrie grooves b in the opposite ends of therotor are comparatively wide apart, as shown in Fig. 1. lil? the bottomsof the grooves b on the opposite sides of the rotor are close together,so as to leave but a thin web of metal between them, as in Fig. 3, thenT provide the rotor 'tensions of the slots c in the rotor.

or drum With a collar-shaped enlargement e atits middle, as shown inFigs. 3 and 4:. This Collar-shaped enlargement is narrovver than thelength of the rotor and is provided With slots that register With andform eX- The pieces d are then placed in these extensions of the slots cin the part e. A ring f is then placed around the Collar-shapedenlargenent to which the pieces (Z are secured if necessary. Thus itWill be seen that the rotor of any rotary fluid machine that hasabutment slide slots of the character described Will be materiallyimproved by the application of my invention, the slots Will beeiectually prevented from contracting by the pieces (Z, due to thespring of the sector-shaped portions of the rotor springing When thepiston slides or abutment slides are under load, thereby preventing`said slides 'from becoming clamped or sticking in their slots.

I Claiml. The combination With a piston drum* engmes having radial slotsfor slide pistons; of distance pieces arranged in said slots to preventthe slots from altering` in Width.

2. The combination With a piston drum or rotor for rotary engines havingradial slots for slide pistons; o' distance pieces arranged in saidslots near their outer edges.

3. The conibination With a piston drum or rotor for rotary engineshaving radialslots for slide pistons; of a ring laid around or rotor for'otary said drum and distance pieces arranged in said slots and attachedto said ring.

4. .The combination With a piston drum or rotor for rotary engineshaving radial slots for slide pistons; of a Collar-shaped 40 enlargenenton the drum having slots registering With those in the drum and distancepieces in the slots of said enlargement.

5. The combination With a piston drum or `otor for rotary engines havingradial slots for slide pistons; of a Collar-shaped enlargement on thedrum having slots registering With those in the drum, a ring laid aroundsaid enlargement, and distance pieces arranged in the slots of saidenlargement.

6. The combination With a piston drum or rotor for rotary engines havingradial slots for slide pistons; of a Collar-shaped enlargement on thedrum having slots registering With those in the drum, a ring laid aroundsaid enlargement and distance pieces arranged in the slots of saidenlargement and secured to said ring.

7. The conbination With a piston drum or rotor for rotary engines havingradial slots for slide pistons; of a ring laid around said drum anddistance pieces arranged in said slots.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing Witnesses.

RUD OLF EISERMANN.

lVitnesses AUGUST TRAUTMANN, \VOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissone' of 'Eatents,

Washington, D. G.

